Pot for molten metal



(No Model.)

' C. BUSH.

POT FOR MOLTE'N METAL.

No. 503,'783. Patented Aug. 22, 1893..

QWM

UNITED STATES PATENT Orriss.

CHARLES BUSH, OF NEWBURG, NEW YORK.

POT FOR MOLTEN METAL.

SPECIFIGATIO forming part of Letters Patent No. 503,783, dated August 22, 1893.

Application filed September 14, 1892. Serial No. 445.838. (No model.)

To all whom it may concern.:

Be it known that I, OHARLEs BUSH, a citizen of the United States, residing at Newburg, in the county of Orange'and State of New York, have invented a new and useful Improvement in Pots for Molten Metal, of which the following is a specification.

My invention relates especially to pots for molten lead and solder such as are usually employed by plumbers and tinsmit-hs. In these pots as heretofore constructed, the surface of the molten metal was continually oxidized by exposure to the air, and this oxidized layer had to be removed or pushed aside to give access to the clean fused metal beneath. This layer of oxidized metal kept constantly increasing and was eventually removed and thrown away.

The object of my invention is to overcome this difliculty and reduce the liability of oxidation to a minimum.

In carrying out my invention I employ in combination with a melting pot a fioating seal, composed of met-al or other suitable material of a lighter specific gravity and a higher melting point, for instance, iron or other metal or clay. This fioating seal is circumferentially slightly smaller than the inside of the melting pot to insure free vertical movement. It is convex on the under side to conform approximately to the bottom of the pot. It is concave on the upper side to form a receptacle from which the molten metal can be dipped with a ladle 'when the fioating seal is pushed down into the pot. It is also provided with a perforation or channel through which the molten metal fiows upwardly into the concave portion of the seal when depressed. i The sealfioats on the surface of the molten metal and entirely covers and protects the same except to an unappreciable extent at a very thin line around the iloat, and at the perforation, and no matter how the seal may be tipped or turned in pushing down to remove molten metal said seal by its shape and buoyancy will come up, right side up, as soon as released.

In the drawings Figure 1. is a vertical section of a melting pot and my fioating seal.

Fig. 2. is a vertical section of the same, in the act of dipping the nolten metal. Fig. 3. is a vertical section of a modification, and Fig. 4. i

is a view of the lifting or pot hook.

The nelting pot a, is of usual construction, and provided with a bail a'. The sides of the pot a., above the rounded bottom taper slight-ly in an upward direction. The tloating seal is represented at b, with a convex under side b', conforming approximately to the'rounded bottom ofV the melting pot. A central perforation or channel at c, is provided through the said fioating seal and a depression or concave d, is provided in the upper surface of the fioat-ing seal, the same forming a receptacle forthe molten metal, and from which it is dipped by hand ladle as shown in Fig. 2, when the floating seal is pushed down into-the pot. The act of pushing the seal down into the potI of melted metal causes the metal to fiow up the opening or channel c, into the receptacle or'concavity cl, and when the ladle is removed and the seal released it rises, the metal returning as it came, and the fioating seal by its lighter specific gravity remaining upon the surface of the molten metal and protecting it from the oxidizing influence of the atmosphere. The act of dipping the metal by ladle is momentary, and the seal rises and rights itself as soon as released. Therefore there is not time for the air to act on the metal.

I prefer to employ (see Fig. 4) the usual pot hook m, the lower end of which is screw threaded at m', to screw into the threaded upper end n, of the perforation in lifting the fioating seal b, but I may perforate opposite sides'of` the upper edge of the fioating seal and provide a bail e, which when desired can be sprung into place to lift the seal out of the melting pot.

The modification shown in Fg. 3. consists in the employment of a secondary floating seal 7r, of hollow material with a perforation in the lower part and located between the first seal b. and the inner surface of the melting pot. This is useful where large bodies of molten metal in large pots are employed in such work as laying sewer and gas pipes in cities, and where the floating seal if proportionately large to the pot would be unwieldy IOO ta'cle froin 'which the 'molten metal -s dipped and difiieultto handle' inse. A sshofwnin Fg- 31,.f1 .hQaSLhseal .155. .lf flllsizj and the molten metal by the deprossion vof this seal is only drawn from the centeurH f t lve mass. i

The Seals b, and k, both settle as the Vm olten i metal is Withdrawn, 'and all'the *metal can 'beiused from the melting potexoept the small quantity in the central channelc. i I The form of the floatingseal not only per-2 mits the molten-metal to be dipped or ladled Out of thedeptesion foreonearity but it; floats right side up' no matter in yvvhatp'way it may be tipped and being'pref'erably'made of i iron the lead o'r solder does not adhere to'it' and the oxdizing of the aiir on'the molten metal is thus p'reve'nted, the metal remaining;

free and fiiidfi i i 1 'llhe'floating seal b, may `be made hollow fl desired', and* it may be made of other 'pnate-a` rial'ormetal than =iron,fsuch material or fine olay as used 'in cruo'ibles being adapftedfor thepurposeL'A 'i' 1 I fclaim'as myinvention- 'i 1.'The` combination with a melting pot, ofi a flpatingseal adapted to'eXolude the surfaoe of* the melt'e'd m'ater'ia'l front 'at'mospheiaetiong'an'lz hatfinga receptaole in the 'upper surface'fro'm'which the melte"d material can ibedipped'and'a'rpassage'Way by whi'eh the: nateial fioys into said redeptacle as .the seal i's tljeprjessedsubstantially'as fspecified. 2.'1The` combination with a meltig" pot for ;f metal,` of fioating' seal "of m'et'al 'or othe'r'` 'uitable material'ha'vig a crvex under side, anjd:"a* conoave"'upper side forming a recep- ;v

* a floating seal having arecept'acle in' the upseal of metal, or other suitable-mate'ial havinga conyex underside conforming approximately' to the bottom "Qf' the pot, aI conoave upper side'forming a receptaole from Whoh the molten metal is dipped when the seal is pushed down 4'there being a. channel through the seal for the molten metal to pass through into .the reeepfeeleeehsfaetelly es end fol' theflprpo'sle'setforth- 4; The" ombin'a """'`1 with a melting pot for metal having a curved bottom, of a fioating seal b. of metal, 0r other s-itable material having a .oofnvex underfsid b' a dep'ession or Vooncavitu'v' Cl, in the upp'enside frming a V'receptaole' and a .channel Athrou'gl'n'said s'eal, 'andaniauxiliary `floating seal M'witlf'a cehltral perforation sub'stantiallj' as and' for'the purposes'set forth.

.The 'combination .with a melting pot, of

per surface from .which the'flmolfie material oan .be dipped and'a ehan'nel'A'for supplying suoh recepitaole as the seal is'depre's'sed; and an' auxiliary floatin'g sealsurijounding the said s'eal and havingan openpcehtezrkfor the molt-en material andV inwwhich tl'o'ats themain seal' sf'ubstantiallyas specified;

Signed by'me this lst dayof August, 1892.

Witnesses:

CHAS. L. CHATTEnToN, i JOHN B. MnsoN. 

